/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.io;

import proguard.classfile.ClassConstants;

import java.io.*;

/**
 * This DataEntryWriter writes data entries to individual files in a given directory.
 *
 * @author Eric Lafortune
 */
public class DirectoryWriter implements DataEntryWriter {
    private final File baseFile;
    private final boolean isFile;

    /**
     * Creates a new DirectoryWriter.
     * 
     * @param baseFile the base directory to which all files will be written.
     */
    public DirectoryWriter(File baseFile, boolean isFile) {
        this.baseFile = baseFile;
        this.isFile = isFile;
    }

    // Implementations for DataEntryWriter.

    public boolean createDirectory(DataEntry dataEntry) throws IOException {
        File directory = getFile(dataEntry);
        if (!directory.exists() && !directory.mkdirs()) {
            throw new IOException("Can't create directory [" + directory.getPath() + "]");
        }

        return true;
    }

    public boolean sameOutputStream(DataEntry dataEntry1, DataEntry dataEntry2) throws IOException {
        return getFile(dataEntry1).equals(getFile(dataEntry2));
    }

    public OutputStream createOutputStream(DataEntry dataEntry) throws IOException {
        File file = getFile(dataEntry);

        // Make sure the parent directories exist.
        File parentDirectory = file.getParentFile();
        if (parentDirectory != null && !parentDirectory.exists() && !parentDirectory.mkdirs()) {
            throw new IOException("Can't create directory [" + parentDirectory.getPath() + "]");
        }

        return new BufferedOutputStream(new FileOutputStream(file));
    }

    public void close() throws IOException {}

    public void println(PrintWriter pw, String prefix) {
        pw.println(prefix + "DirectoryWriter (base " + (isFile ? "file " : "directory") + " [" + baseFile + "])");
    }

    // Small utility methods.

    /**
     * Returns the file for the given data entry.
     */
    private File getFile(DataEntry dataEntry) {
        // Use the specified file, or construct a new file.
        return isFile ? baseFile
            : new File(baseFile, dataEntry.getName().replace(ClassConstants.PACKAGE_SEPARATOR, File.separatorChar));
    }
}
